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  1. Note, I am a software guy, and I tend to have a...

    Note, I am a software guy, and I tend to have a high level view of electronics, but often times I don't have the depth. I have never used CharliePlexing, only looked at it from reading the spec...
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    A couple of things that I've seen over time that...

    A couple of things that I've seen over time that have been posted to the group or elsewhere.

    The Teensy 4.1 has several different options for audio processing:

    First I2S bus: The simplest...
  3. I remember Digispark, but I decided some time ago...

    I remember Digispark, but I decided some time ago that I never wanted to deal with the restrictions of the ATtiny85 and got rid of them. I don't remember the dithering, sorry.

    Lets see some...
  4. IIRC, in the actual I2C protocol, the slave...

    IIRC, in the actual I2C protocol, the slave address is 7 bits, and the bottom bit is 0/1 depending on whether this is a read/write request (0 is a write request from the master to the slave, 1 is...
  5. I don't have anything to do with megadue...

    I don't have anything to do with megadue (whatever that is). I just maintain a spreadsheet that compares the pins on each Teensy, so I know what the differences are:

    ...
  6. Note the pins in the Teensy 4.1 are different...

    Note the pins in the Teensy 4.1 are different than the Teensy 3.5/3.6. Whether this matters depends on what pins are used by the code.

    Off the top of my head some of the differences include:

    ...
  7. You just use the pin with the normal analogRead. ...

    You just use the pin with the normal analogRead. Note the analog pins A10-A14 can only receive input in the range 0 .. 3.3v. If the pin gets more than 3.3v, you can damage the Teensy.

    On the...
  8. You might look at the Gamedunio 3X dazzler. ...

    You might look at the Gamedunio 3X dazzler. These are smart displays that have a FT815 graphics processor:

    https://excamera.com/sphinx/gameduino3/
    ...
  9. I don't know if a Teensy 4.1 is up to the task,...

    I don't know if a Teensy 4.1 is up to the task, but I am reminded of this youtube video from a 2012 conference about using Python to recognize squirrels and then train water guns at said squirrels...
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    It would be somewhat more, but you might look at...

    It would be somewhat more, but you might look at protosupplies.com which offers a mostly fully soldered Teensy 4.1, includes:

    https://protosupplies.com/product/teensy-4-1-fully-loaded/
    ...
  11. The code that rav posted above uses a fast tanh...

    The code that rav posted above uses a fast tanh function. If you are using the real tanh function, you probably want to use tanhf instead if the calculations are done in float. The tanh function...
  12. There is the pixelmatrix/smartmatrix/smartled...

    There is the pixelmatrix/smartmatrix/smartled site

    https://community.pixelmatix.com/


    Here are some things that I posted in bringing up my display:

    Evidently the original Teensy 4.0...
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    Since I was printing voltages and amps, which in...

    Since I was printing voltages and amps, which in theory are supposed to be positive, I didn't worry too much about the negative case. This should work:


    // Convert a floating point number to a...
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    Though you can get splitter cables that convert a...

    Though you can get splitter cables that convert a 4-pin TRRS cable to a pair of 3 pin TRS cables:

    ...
  15. Note for the stacking headers for the Teensy LC,...

    Note for the stacking headers for the Teensy LC, 3.2, or 4.0 go with the Adafruit ItsyBitsy/Teensy headers and not the Sparkfun headers:

    https://www.adafruit.com/product/3366
    ...
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    The wrapper code is just a class that I have that...

    The wrapper code is just a class that I have that has the neopixel data structure as a member, plus some other elements, such as the pins used, etc.

    Basically you need something like this:


    ...
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    I ran into problems switching back and forth...

    I ran into problems switching back and forth between using the SPI device (in my case it was driving two ST7735 displays) and using the prop shield for doing ws2812b/neopixels.

    Here is the thread...
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    If you git clone or svn checkout:...

    If you git clone or svn checkout: https://github.com/WMXZ-EU/MTP_t4.git there are 3 directories with the modifications to add MTPDISK with serial.

    In modifications_for_cores_teensy4 is the...
  19. It was left out of the original pinout card...

    It was left out of the original pinout card either by accident, or it just didn't fit with the layout. It was listed in some of the spreadsheets that were published in this site when the beta test...
  20. The Smartled V5 shield uses pins 10-13: ...

    The Smartled V5 shield uses pins 10-13:

    http://docs.pixelmatix.com/SmartMatrix/shield-t4.html

    You can switch to the Teensy 4.1 and use the built-in SD card. I have a Teensy 4.1 running the...
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    I was answering a query on the audio library, and...

    I was answering a query on the audio library, and I opened up the Part_3_03_TFT_Display example. Unfortunately, this example looks like it has not been updated for the Teensy 4.1 (and even the...
  22. I suspect there are many parts to your question,...

    I suspect there are many parts to your question, and I'm not sure I understand exactly what you are asking.

    First of all you can't display raw analog values on a display. I.e. the Teensy is not...
  23. Thanks. I had no idea of what commands to use. ...

    Thanks. I had no idea of what commands to use. FWIW, fuse is the layer to add user file systems, but I didn't see a fuse specific to mtp, and I was just trying the low level mount option. I just...
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    After all there is only one Paul, and with PJRC...

    After all there is only one Paul, and with PJRC being down to just him and Robin due to the virus and distancing rules, I imagine he made the decision to come out with the bootloader first. There...
  25. I think I will wait until beta 6 comes out. ...

    I think I will wait until beta 6 comes out. Hopefully the necessary patches will be present. It is good to see the things coming together however.
  26. Well, in theory it should work, but I had trouble...

    Well, in theory it should work, but I had trouble getting to work.

    I downloaded https://github.com/PaulStoffregen/cores.git and replaced those files in a copy of my current Teensy 4.1.

    I used...
  27. Teensy 4.1 flash memory support (LittleFS)

    I wasn't sure if this should go in the 1.54 beta 5 thread, or one of the other threads. I haven't been closely following a lot of the work that is going on.

    I was wondering where we are in terms...
  28. Yes, in terms of the smoke, evidently I didn't...

    Yes, in terms of the smoke, evidently I didn't release enough of it, as it seems to work. :)

    I used my soldering iron at the highest heat and solder braid to remove the solder from all 4 pins on...
  29. And it looks like it is pins 52 and 54 that need...

    And it looks like it is pins 52 and 54 that need to be soldered on the psram. Thanks, KurtE.

    Before getting to the soldering however, I was reattaching the Teensy to the RGB display I had it...
  30. Hmmm, mjs513: Teensy41_flash: In function...

    Hmmm, mjs513:



    Teensy41_flash: In function 'void loop()':
    Teensy41_flash:117: error: 'class LittleFS_QSPIFlash' has no member named 'formatUnused'
    if (rr == 'f') myfs.formatUnused( 0 , 0...
  31. Is there a simple test for flash memory being soldered on the 4.1 correctly?

    I have a Teensy 4.1 and it appears the PSRAM I soldered on to it either was mis-soldered or the chip does not work (external_psram_size is 0).

    I used Paul's test for psram:

    ...
  32. Well also there is the issue of the Teensy...

    Well also there is the issue of the Teensy 4.0/4.1 not having a DAC pin (DAC is digital -> analog, basically analogWrite will modify the voltage on the pin, rather than rapidly turning it off/on like...
  33. You might want to post pictures, and be clearer...

    You might want to post pictures, and be clearer on what doesn't work.

    I've had breadboards where over time some of the slots just do not work. If I move the Teensy to a different row/column, it...
  34. Note in your schematic, you connect the ground...

    Note in your schematic, you connect the ground wire from the power & converter to the AGND pin (between VIN and 3.3v on the right side if the USB connector is facing up). On the Teensy 3.2, 3.5, and...
  35. On the Teensy 3.2, 3.5 and 3.6, the following...

    On the Teensy 3.2, 3.5 and 3.6, the following pins are only for analog input (i.e. you can't do digital read, digital write or analog write, you can only do analog read):

    A10, A11


    On the...
  36. Sparkfun has a micro-SD sniffer that can be used...

    Sparkfun has a micro-SD sniffer that can be used to access the 8 pins. The design is also available at OSH park:

    https://www.sparkfun.com/products/9419
    ...
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    Though the problem with both the Octows2811 and...

    Though the problem with both the Octows2811 and the 74AHCT125 used in the Octows2811 is that they are for 5v lights, and the OP said that he/she is using 12v lights. If the 12v lights can be...
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    It sounds like the Pi foundation learned their...

    It sounds like the Pi foundation learned their lesson from the Pi Zero.
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    Note, I2C is a shared bus. Each I2C device has...

    Note, I2C is a shared bus. Each I2C device has an address. This means as long as your OLED display does not use the addresses used by the audio shield (0x0a, 0x1a), you can hook the display on to...
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    Though given the price, I wonder if we are going...

    Though given the price, I wonder if we are going to have the same problem that we have with the Pi Zero? Namely, you can only order them in limited quantities, and the sellers had times when they...
  41. I suspect to be complete, for DAC's you need to...

    I suspect to be complete, for DAC's you need to separate the 3.2 (1 DAC) from the 3.5/3.6 (2 DACs). The LC has a single DAC also.

    The T4.0/4.1 have MQSR/MQSL.

    All of them should have USB audio...
  42. I have no idea if it works or not, but one...

    I have no idea if it works or not, but one thought might be to use the USB host support, and connect several USB to serial converters to a USB port. If you need more than one, presumably you would...
  43. For Teensy 3.1, 3.2, 3.5, and 3.6, there are a...

    For Teensy 3.1, 3.2, 3.5, and 3.6, there are a few others, but the pins overlap, so if you choose one pin in the pair for DC/CS, you can't use the other pin for the SPI pins:

    Paul made this post...
  44. It looks like ILI9341_t3 does not have support...

    It looks like ILI9341_t3 does not have support for the second SPI bus in Teensy 4.0/4.1. Some display drivers have a method to access the second SPI bus, some do not.

    Note, there are 2 concepts. ...
  45. Looking at the schematic on the Powerboost, the...

    Looking at the schematic on the Powerboost, the micro-USB connector on the Powerboost does not connect the D+/D- pins, so there is no way to use that port directly.

    What you can do is use the...
  46. Note in your picture you need a few extra pins: ...

    Note in your picture you need a few extra pins:

    If you use flash memory or the micro SD card reader, you need to connect the ground pin on the left;
    You always need to connect the ground pin...
  47. Note, I'm not a audio expert, just somebody who...

    Note, I'm not a audio expert, just somebody who plays at audio, so I can't tell you about the differences between the different outputs. My main thing is for costumes where I want portability. ...
  48. You might want to look at this Adafruit product,...

    You might want to look at this Adafruit product, which is I2S to headphones:

    https://www.adafruit.com/product/3678


    I bought this board from Amazon in the USA, perhaps there are similar...
  49. A few other things about WS2812Bs from multiple...

    A few other things about WS2812Bs from multiple vendors:

    In a single strand, you can only have RGB or RGBW WS2812B's. The RGBW's (which have a dedicated white led) use the same protocol, but...
  50. Note, the Teensy 4 only has pin 11 being SPI...

    Note, the Teensy 4 only has pin 11 being SPI MOSI, pin 12 being SPI MISO, and pin 13 being SPI SCLK. In particular, pin 14 is not the SPI MOSI pin. On the Teensy 3.x, pin 14 was an alternate for...
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